Disclaimer I am not the fastest guy in the world, I’m at 4800 in multiplayer right now and I tune my cars based on how I feel than what’s fastest. My ideal tunes give me control and make me comfortable in online races.
I kinda struggled with figuring out the downforce in my tunes for a while and usually just ran max at all times which is usually too much, but I found a useful way to balance it that works for me.
What I do is I set it based on the weight distribution of the car. For example let’s say a car is 40 front, 60 rear. I’ll try to make sure that whatever I set the rear downforce to I have 40 percent of that in the front. So if I have 300 downforce in the rear I go 200 in the front. 500 rear I go 333 in the front. Etc. sometimes you can’t get it exact or the adjustment doesn’t go as far in the front as the back but I try to make it as proportional as I can.
When doing this I noticed at high speeds the car is way easier for me to handle because the weight balance is the same as at low speeds, making me faster.
Hope this helps!
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The thing with downforce is, the more downforce you have the more stable the car is at high speed, but it’s also much less agile, but you also get better cornering at low speed.
It’s very similar for aircraft, you can choose between agility or stability or a balanced middle thing. That is why stunt planes for shows are very agile, they are very very unstable and difficult to fly.
I usually just keep it at 50% most of the time but sometimes I set it to 75%. I don’t use 100% because that makes it too hard to do the little bend on Nordschleife on the long straight at the end. With too much downforce you can’t do that right.
I can confirm that the 1st poster is correct, the more rearward the more rear downforce you need for balance.
Meta is generally full front, min rear. This is not just about to speed, but high speed rotation as well, otherwise min aero would be the rule. The exception to this seems to be LMP cars, which don’t gain much from low rear downforce and don’t suffer from chronic high speed understeer.
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Also you may want to watch out for cars that have a built in diffuser (not the rear bumper upgrade) as some cars have enough rear downforce with the stock wing to not need a race adjustable rear wing.
For me personally on a 50-50 car I have 100 front downforce and 81-82 rear downforce.
I just use no Forza aero 
, but if I have adjustable aero I just use min/min or max/max depending on track and car, but usually like in Forza gt I just run min/min to reduce drag, since Forza gt cars have enough grip as it is. In E-A class open u don’t rly need that much Downforce, so min/min there too (I see no advantage in max/min, its just makes handling worse), in S and higher because I tend to avoid race tyres if possible, I use max/max aero, tho some cars like 911 gt1 and similar are fine with low Downforce
Tested on maple different aero settings, and if car have enough grip, no aero, min/min and max/min aero have same pace, but if u lack grip, max/max is faster. It all depends on track and car choice.
I dont understand aero tuning so appologies if I come across a little dumb,lol. Doesnt increasing aero to max give you better ,more planted cornering at the expense of top speed?
Just try it out yourself use a car with max downforce on the last straight on Nordschleife and then use one with just 50%. It will be more stable with max downforce but it will be hard to do the bend if it’s too much.
not really when balance > grip.
Having too much rear downforce just makes you understeer more the faster you go so you compensate with springs to understeer less at high speed and so you oversteer at low speeds (the slower you do the more you oversteer) and understeer at high speeds, I think you are better off having a neutral aero so the faster or slower you go won’t change the balance of the car and is easier to drive and tune.
@JohnDoe9302 @uber_understeer thanks for the replies,ive never really messed with aero so going to have a play. Its the same when I play GT7, I never mess with aero except to alter PP. 
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Aero is very interesting because it’s the same for aircrafts. I am not a scientist that knows things about that, but it’s all the same if it comes to physics.
Just use a search engine of your choice (maybe Brave) to get deeper into the topic if you feel like it.
If you place a wing direction front onto a plane it gets more unstable, but also much more agile, you make it go backwards it’s more stable but less agile. My english isn’t the best, but I guess you know what I mean. The more you “cut” the air the more stable, the less the less stable.
That is all very interesting.
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I just need a car with the Raptors thrust vectoring.